Time travel

[Thapa_Laxman]

Do you believe in time travel?
If it is possible then may be in near future humans shall invent a time machine. And obviously they will travel to future and past.
This means that they will travel to our times.
If true, then why are we not able to see or interact with them?
Are they (future humans) using some kind of technology so that we cannot see them and their time machine?
Or the aliens and UFOs that people has claimed to be seen are actually future humans visiting past?
Or the future humans don’t like traveling past?
Or the human kind is destroyed before the time machine could be built?

[Corky13]

"Time" is a invention of the humans..i dont believe in Time-travel...i believe more in the theory of traveling in a paralel-universe O.o

[Dr.N]

theory is if you go up to 300000m/s you can do so.. but its still a thoery.. not prooved

[Corky13]

thats why you have to "believe" in a theory ^^

[Thapa_Laxman]

Originally posted by Corky13
"Time" is a invention of the humans..i dont believe in Time-travel...i believe more in the theory of traveling in a paralel-universe O.o

Are you saying that before man evolved there was no time?

[3dGator]

Personally I dont believe that time exists, but if you do, I would believe that you, as all the rest of us, are already travelling through time! Think about it: it is, lets say 12:00 now. the next minute its 12:01. You've just travelled through 1 minute in time! Plus, you havent moved an inch! No need for ludicrously high speeds, just patience! :D

Thats my view!:p

[Lord Soc]

There are some extremely interesting scientific debates/articles on this matter floating around... if Einstein is to be believed, it is impossible.

"Time: what stops everything from happening all at once" :dunno:

[Dr.N]

ya but wat about going to the past:p

[Daniel]

it might exist, who knows

[Corky13]

Past and Future simply dont exist...do you can feel time ? do you can see or smell it ? nope..time is an illusion. What we call "time" is nothing more than a counter for continualy happenings...like the moving of the engine in a clock...all about counting happenings...
You cant travel in the Future because it havent happened yet...hope you understand what i want to say ^^..
Same goes to the past..it happened but does the past exist somwhere ? is there a cosmic Supercomputer that safes hapennings and spits them out if someone travel back in the past ? no..the moments are vanquished and nothing will bring them back...

[3dGator]

Originally posted by Corky13
Past and Future simply dont exist...do you can feel time ? do you can see or smell it ? nope..time is an illusion. What we call "time" is nothing more than a counter for continualy happenings...like the moving of the engine in a clock...all about counting happenings...
You cant travel in the Future because it havent happened yet...hope you understand what i want to say ^^..
Same goes to the past..it happened but does the past exist somwhere ? is there a cosmic Supercomputer that safes hapennings and spits them out if someone travel back in the past ? no..the moments are vanquished and nothing will bring them back...

My belief exactly. Time is just something us Humans created so as to keep track of events.

[Thapa_Laxman]

Originally posted by Corky13
Past and Future simply dont exist...do you can feel time ? do you can see or smell it ? nope.....

Do you feel radio waves? nope.. this doesnot mean that it doesn't exist.

[Thapa_Laxman]

Originally posted by 3dGator
Personally I dont believe that time exists, but if you do, I would believe that you, as all the rest of us, are already travelling through time! Think about it: it is, lets say 12:00 now. the next minute its 12:01. You've just travelled through 1 minute in time! Plus, you havent moved an inch! No need for ludicrously high speeds, just patience! :D

Thats my view!:p

I agree, It turns out that, in some sense, we are all time travelers. As you sit at your desk, doing nothing more than clicking your mouse, time is traveling around you. The future is constantly being transformed into the past with the present only lasting for a fleeting moment. Everything that you are doing right now is quickly moving into the past, which means we continue to move through time.

[Jason-Lavoie]

thus the name of the game.. Timesplitters 2.... oh... ok nm i am off topic here... lol

[Dr.N]

this is a good topic to discuss.. im enjoying readin what you all think.. really cool

[Corky13]

@Thapa-Laxman
But there are several ways to recognize radio waves ;)
trough antennas connected with computers for example ;)

BUT theres no way to localize and recognize a "time wave" because it just dont exist...

and i think also all sorrow came from the invention of time...you always are worried about things that might happen in the future because of events happened in the past...but if you believe like me that there is no past and future you will loose all forms of sorrow and psychical pain...what have to come in the "future" will come and you cant really do anything against it...you will now what to do when the moment is here

Of course im not saying you just dont have to pull the rope if you are parashooting. Would be a good idea to pull it...


I read somwhere that the "present" should last for 0,003 secs...this is the time the brain need to send out a electric impulse to nerves...a short "dead-time" but this is a bit over the top i guess...

[Thapa_Laxman]

=> Corky13
maybe you are right.

[Chokin Hazard™]

What's up with these physics related threadS lately? LOL

[ross_coe]

One way that you could travel through time theorically is to travel faster than light.

Trouble is....because of E=MC squared, that's impossible. because the energy needed to send an object to light speed is directly relative to the mass of that object. as the object accelerates its mass increases. when it reaches light speed the mass becomes infinite, and therefore the energy needed to travel at light speed becomes infinite. light particles have no mass, hence they travel at the speed of light.

But time does exist. We are all sitting on the space-time continuum. We travel thru time in a linear fashion. And maybe one day we'll be able to travel in different directions thru time by being able to bend the space-time continuum.

Time is just another dimension, and as we can travel thru the other 3 with relative ease, it seems to make sense that we should eventually be able to travel thru the fourth.

[Thapa_Laxman]

If true, then why are we not able to see or interact with them?
Are they (future humans) using some kind of technology so that we cannot see them and their time machine?
Or the aliens and UFOs that people has claimed to be seen are actually future humans visiting past?
Or the future humans don’t like traveling past?
Or the human kind is destroyed before the time machine could be built?

[Daniel]

everyone is arguing and giving evidence as if you can actually understand it. Fact is, I say maybe, maybe not. No one knows for sure, so it's useless arguing like you actually know what your talking about :p

[Julhelm]

Time is dependent on light, so theoretically you can take a shortcut by "bending" space to emerge at your destination in a significantly shorter time than normal, which is how wormholes work.

[3dGator]

Julhelm: can you elaborate more on what you said about time being dependent on light? cuz I dont find that makes sense... I understand time and space being related, but not time's dependancy on light.

[Julhelm]

When you accelerate to near the speed of light, time will appear to slow down, and at the speed of light, time will appear to "freeze", and theoretically, "rewind" once you pass the speed of light.

Example:

You shoot a person with a normal handgun @ 200 meters. where muzzle velocity is ~400 m/s.

This means you'll hit the guy 0.5 seconds after pulling the trigger.

Now you shoot another guy with a gun where muzzle velocity is ~300.000 m/s; ie speed of light. This is basically insta-hit, like a laser.

Now, according to theory, if muzzle velocity is increased beyond ~300.000 m/s, you'll actually start to hit the guy before you pull the trigger.

If you were to do this with a spaceship, supposedly time around you would appear to move backwards while time "inside" would act normal.

[Corky13]

Well how do you know that black-holes are "wormholes" ? wormholes are just a theory...but to say the truth i actually believe in black- worm- and white holes :D

[Julhelm]

I don't think a black hole would act anywhere like a wormhole, because the immense gravity of a black hole would own you.

Black holes are black because they suck all the neighbouring light into them with their huge gravity. A wormhole would just be a tunnel connecting two points of space with eachother in a spherical universe.

[Corky13]

Do you dont think i know what a black hole is -_-...? Man im kind of a Cosmo-freak :D i know black holes are named black holes because the even swallo photones ^^
But i believe that wormholes are directly connected with black-holes. because the whole spheric universe theory stinks ^^ Black holes arent at the edge of the universe..! even in the center of the milky-way lays a black hole and someday in billions of years it will swallow US if we exist that long ^^.

Do you know the theory about the white holes ? they spit the whole super-compressed mass out of them which was once swallowed by a black-hole. And the connection is called "wormhole". And thats the place where the "time" can move backwards because the super-compressed stuff inside a black hole regains its old form afert leaving the range of a white hole. Sounds a bit weird ha ? But mathematic theorys are showing up that it could be really happening...after you are comprassed to a infinite small point you get decompressed like nothing has happened. This infinite Point itselfs is a unique dimension because there dont exist any up down left right front back etc. We cant imagine it but we can make theories of the things behind...

Oh and one thing to the "time-backwards" thing. I actually believe that you cant be faster than light. And i think our "time" is different from the space-time-continuum...we have future and past but in the space-time-continuum and all its..whatevers...there is just the changing of the speed of events until a full stop. but not moving backwards in time. Whats for us 10 seconds is for others 1000 Years...well maybe you can call it "travel in the future" ^^ haha. But you can never return in your original time...thats my theory and i recognize once more that my english sucks -_-

[Julhelm]

If you look at a distant star, what you're seeing is that star thousands of years ago.

Hence the connection light-time is obvious.

[Corky13]

well...if you put it that way of course there is a connection.
hey wouldnt that mean you cant travel in the past but you can look in it ?.....ok imagine you travel with your super-duper-monstomatic-telescope through a black hole that dont links to a different galaxy but to a place immensly far away. Like Proxima or Alpha Centauri and if you look back to earth you maybe can see with your super-duper-monstromatic-telescope how you make your lunch-package for the yourney you have made to AlphaCentauri

:D:D:D:D wood be cool.."ehhh where i put my key...whatch it from a other galaxy !"

*GivesJulhelmABeer*

[claWda]

Originally posted by chokin_hazard
What's up with these physics related threadS lately? LOL

They're threads for people with maturity and intelligence. These people are able to discuss and exchange thoughts on life's more complicated matters, difficult and complex theories. You know, delicate stuff.

A physics related thread is for those who are capable of doing more than play computer games all day long, write "lol" in every sentence, spam threedy with unimportant posts and abuse threads with funny pictures gathered from a site made for 12 year old little boys

(This thread is not for you)

[Thapa_Laxman]

Originally posted by ross_coe
One way that you could travel through time theorically is to travel faster than light.

Trouble is....because of E=MC squared, that's impossible. because the energy needed to send an object to light speed is directly relative to the mass of that object. as the object accelerates its mass increases. when it reaches light speed the mass becomes infinite, and therefore the energy needed to travel at light speed becomes infinite. light particles have no mass, hence they travel at the speed of light.


You misinterpreted the energy- mass equation. Reason:
Undoubtedly the most famous equation is E = mc^2. This equation says that energy is equal to the rest mass of the object times the square of the speed of light. Mathematically, since the speed of light is constant, an increase or decrease in the system’s rest mass is proportional to the increase or decrease in the system’s energy. This relationship shows how a system with very little mass has the potential to release a phenomenal amount of energy (as E=mc^2 is an colossal number). In nuclear fission, an atom splits into two forms of atoms, the sum of the two atoms’ masses being less than the mass of initial atom. Where did the missing mass go? It was released in the form of heat or in other words the so-called missing mass was converted in kinetic energy. Nuclear fusion is another nuclear event similar to nuclear fission where two atoms combine in extremely high temperature to form a single atom. The mass of this atom is less than the sum of the masses of two contributing atoms. Here also the missing mass is converted into energy.
One often-misinterpreted, as you, aspect of the energy-mass unification is that a system’s mass increases as the system approaches the speed of light. This is not correct. The energy-mass equation defines the amount of energy released when a rest mass is fully converted into energy.
Let’s assume that a space ship is streaking through space. The following occurs:
1. Energy must be added to the system to increase the ship’s speed.
2. More of the added energy goes towards increasing the system’s resistance to acceleration.
3. Less of the remaining added energy goes into increasing the system’s speed.
4. Finally, the amount of added energy required to reach the speed of light would become infinite.
As seen from above steps, there is no reference to mass. Nor does there need to be.

[Lord Soc]

Originally posted by Thapa_Laxman
You misinterpreted the energy- mass equation. Reason:
Undoubtedly the most famous equation is E = mc^2. This equation says that energy is equal to the rest mass of the object times the square of the speed of light

Actually, you're wrong there Thapa. In "E=mc^2" "m" stands for the relative mass not the rest mass as you suggest.

"m" (relative mass) is equal to the rest mass divided by the square root of: 1 minus [the speed of the object squared divided by the speed of light squared]. Therefore, if the object's speed, "v", = 0, the relative mass = rest mass. But if v approaches c, then rest mass approaches infinity, and energy approaches infinity. Hence the impossibility of travelling at or beyond the speed of light... :)

Of course, if anyone disproves this, we will have to rethink all the fundamental physics that we have based so many theories on. :D

ClaWda -They're threads for people with maturity and intelligence. These people are able to discuss and exchange thoughts on life's more complicated matters, difficult and complex theories. You know, delicate stuff.

A physics related thread is for those who are capable of doing more than play computer games all day long, write "lol" in every sentence, spam threedy with unimportant posts and abuse threads with funny pictures gathered from a site made for 12 year old little boys
ouch! Put those claws away.

As a side note....tachyons are theoretical particles, (there is no real evidence to back up their 'existence') thought by some scientists to travel at a speed greater than that of light, which means they are doomed to travel backwards in time. There was a rather interesting StarTrek episode involving them....

[Thapa_Laxman]

Originally posted by Lord Soc
Actually, you're wrong there Thapa. In "E=mc^2" "m" stands for the relative mass not the rest mass as you suggest.
"m" (relative mass) is equal to the rest mass divided by the square root of: 1 minus [the speed of the object squared divided by the speed of light squared]. Therefore, if the object's speed, "v", = 0, the relative mass = rest mass. But if v approaches c, then rest mass approaches infinity, and energy approaches infinity. Hence the impossibility of travelling at or beyond the speed of light... :)
Of course, if anyone disproves this, we will have to rethink all the fundamental physics that we have based so many theories on. :D


No, I think that you also got wrong, in E=mc^2, c stands for the speed of the light. So, in that equation, there is no mention of the velocity of the mass as I mentions earlier and in the space ship example. It only defines the energy released when a mass is destroyed.
You actually got the right answer from a wrong reason. Please read my previous post(space ship example) again so you may get the right reason.

[Lord Soc]

No, I think that you also got wrong, in E=mc^2, c stands for the speed of the light. So, in that equation, there is no mention of the velocity of the mass as I mentions earlier and in the space ship example. It only defines the energy released when a mass is destroyed.

This is where it gets all complicated and language barriers come into effect. :D

Reread my post slowly. I have used "c" to symbolise the speed of light, and "v" to symbolise the speed of the object.

I was referring to your incorrect assumption that "mass isn't needed to explain why anything with mass cannot reach the speed of light". I mentioned the speed of the mass (v) when explaining how to calculate the relative mass ("m" in the equation) from the rest mass (which you mistakenly thought was what "m" stands for).

Perhaps this will help:

[Chokin Hazard™]

You guyz are hard out physicians :p

[Lord Soc]

Physicists :p :roll:

Being a physician wouldn't be too bad, but I'd rather be a pathologist. :halo:

[USED]

hmmmm excellent information here guys.. This is the kind of debate that I can appreciate!!!!

But I don’t think you all have been keeping up with the happenings in the world of Physics :)

"A new laboratory experiment at the NEC Research Institute in Princeton claims to have achieved propagation speeds of 310 c (c = speed of light). [i] This made headline news around the world, despite disclaimers by the authors about any violations of special relativity. This type of experiment supplements and extends earlier "quantum tunneling" experiments. [ii] It is still debated whether these experiment types using electromagnetic radiation (e.g., light) can truly send information faster than light. [iii]

Whatever the resolution of that matter, the leading edge of the transmission is an electromagnetic wave, and therefore always travels at lightspeed. See Figure 1 above and caption below for an overview of the Wang et al. experiment. If the trailing edge of the light pulse went continuously from A to C, it would indeed exceed the speed of light. However, reality is probably that a smaller light pulse shape is created at the exit to the chamber when the leading edge of the pulse arrives, because the trailing edge of the exiting pulse leaves the chamber even before the trailing edge of the original pulse has entered the chamber. That makes the appearance that the trailing edge traveled faster than light an illusion.

However, such experiments have served to raise public consciousness about the faster-than-light-propagation concept, for which good evidence involving electrodynamic and gravitational forces (rather than light) exists."

link to full artical.. there is also some working being done in the UK and they have acheaved the speed of light.. http://www.metaresearch.org/home/viewpoint/archive/010824FTL/Meta-in-News%20010824.asp

[Thapa_Laxman]

Thank you all for you replies. But I am not getting answer to my second question, for all who believe in time travel =>
If true, then why are we not able to see or interact with them?
Are they (future humans) using some kind of technology so that we cannot see them and their time machine?
Or the aliens and UFOs that people has claimed to be seen are actually future humans visiting past?
Or the future humans don’t like traveling past?
Or the human kind is destroyed before the time machine could be built?

[martimus]

seen as how how your all so damn clever, answer me this...

if a photon has no mass...why does it become affeted by the gravatational pull of a black hole eh? EH?

i'll give ou something to think about...

no matter how small an amount of time, our brains still take time to process information, relay it to other parts of the brain, then react.

so were all living in the past.

all i remember about physics is strange top bottom charm quarks. it makes mewonder if the physicists who named them were slightly bored, especially how it goes into them having different flavours...?? :dunno:

[Corky13]

@Thapa
We are all dead before someone builds a time machine ^^
Our dying starte recently with this "holy" war of some wannabe world-leader guy :grr:

[Thapa_Laxman]

=>martimus
Originally posted by martimus
if a photon has no mass...why does it become affeted by the gravatational pull of a black hole eh? EH?


.....You ask how a star's gravitational field can bend the path of a massless photon. This takes us into the realm of Einstein's general theory of relativity. The mass of the photon isn't attracted to the star's mass under Einstein's theory. Rather, the star's mass distorts space and the photon's path changes because the space is curved, says Paul Hewitt in his book Conceptual Physics.....

Maybe this link will lighten your question

Photon Mass (http://www.usatoday.com/weather/resources/basics/wonderquest/photonmass.htm)

[martimus]

so, if a stars mass warps space, then it warps time also, cos space and time are not seprate right? the same thing, space-time? so something with massive amounts of mass, like a black hole, actually distorts time, right?

[Thapa_Laxman]

=>martimus

yes and do you believe in time travel? If yes then what do you think about my second question?

[martimus]

hmmm....

well assuming that time travel is possible (AN ASSUMTION FOR THE SAKE OR ARGUMENT!) then first we have to wonder why they are travelling back i the first place.

obviously this technology is not going to be available to everyone, so it wont be commnplace, just maybe governments etc.

so, the way i see it there are two ways ways to go.

first, the government is a nice one, and the reason they travel is to learn about their distant past yadda yadda in order o better understand themselves. in this instance, the reason why we never see them is obviously cos they have the technology to travel time!!! im sure they have the technology to remain undetected.

second, and much more likely, whoever is in control of such technology is using it malicously, eg advancing themselves in the future by aiding themselves in the past kind of thing.

but that couldnt happen cos it wpuld cause a crazy paradox.

but anyhow it all seems unlikely, but in an infinate universe such is the way of things. both infinatly improbable and infinatly possible

i saw a doleran for real once

[Dr.N]

so it wont be commnplace, just maybe governments

they might be behind all those strange accidents and wars.. :D liike 9/11

[martimus]

dont say that!!

you'll turn it into a 9/11 conspiracy time travel mega hybrid thread.

i fear its already too late

[Chokin Hazard™]

Have any of you guyz heard about that "phidelphia experiment"? I m not sure wether thats is true or not but they said that they could send a navy ship back in time. But freaky sh*t hapend to the passengers for eg half of their body went through walls and got stuck there.far out its like freaky as

[BlackSeer]

Originally posted by chokin_hazard
Have any of you guyz heard about that "phidelphia experiment"? I m not sure wether thats is true or not but they said that they could send a navy ship back in time. But freaky sh*t hapend to the passengers for eg half of their body went through walls and got stuck there.far out its like freaky as

There are zero proof for that, move along now citizens ;)

[Corky13]

wtf is this philadelphia experiment ? Can anyone say something about this ? I never heard of it but i like good horror stories :D

[BlackSeer]

Well there was suppose to be a experiment made by the us navy about teleporting / invisble and it ended rather messy if you ask the people that love this kind of stuff.

http://www.history.navy.mil/faqs/faq21-1.htm

[Thapa_Laxman]

=>phidelphia experiment:
Actually the original name of the experiment was Feel and Ostract Letratohid Bizzarethed Experiment .
:D :D :D :D :D :D :D :D :D :D

[Corky13]

Ahhh i see...Military fooling around with teleporting and camouflage engines eh ? ^^ But i dont found any hint about the things described by chokin_hazard ...so i guess this is anyway to much over the top ti believe it...

[BlackSeer]

Not sure about him but my side of the story is the general story.

If "true" they were working on something else then time travel. Anyway that what the source tell. But teleport is a bit of traveling past time and space. :roll:

[ross_coe]

hmmm i heard bout the philly experiment a while ago....dunno what to make of it tho :p but from what I read there was a lot of freaky stuff going on....like crewmen found sticking out of solid metal parts of the ship

wasn't there a film with Kirk Douglas or someone like that, that was based on the philly experiment (they ended up going back in time and had a chance to stop the pearl harbour attack)?????

I also think that if time travel did become possible, there's little or no way the powers-that-be would let the general public in on the secret. there would be too much at stake if everyone started going back in time. Plus there would be too much for the people who had the time machine to gain from that they wouldnt wanna share the wealth and power that having a time machine would give them.
It would be a heavily regulated and secretive discovery either way.

[Chokin Hazard™]

Originally posted by ross_coe
hmmm i heard bout the philly experiment a while ago....dunno what to make of it tho :p but from what I read there was a lot of freaky stuff going on....like crewmen found sticking out of solid metal parts of the ship

wasn't there a film with Kirk Douglas or someone like that, that was based on the philly experiment (they ended up going back in time and had a chance to stop the pearl harbour attack)?????

I also think that if time travel did become possible, there's little or no way the powers-that-be would let the general public in on the secret. there would be too much at stake if everyone started going back in time. Plus there would be too much for the people who had the time machine to gain from that they wouldnt wanna share the wealth and power that having a time machine would give them.
It would be a heavily regulated and secretive discovery either way.

Hard™

Maybe Bill Gates time traveled and stole the idea of windows from someone

[Thapa_Laxman]

There is a theory regarding time travel that brings up the idea of parallel universes, or alternative histories. Let's say that you do travel back to meet your grandfather when he was a boy. In the theory of parallel universes, you may have traveled to another universe, one that is similar to ours, but has a different succession of events. For instance, if you were to travel back in time and kill one of your ancestors, you've only killed that person in one universe, which is no longer the universe that you exist in. And if you then try to travel back to your own time, you may end up in another parallel universe and never be able to get back to the universe you started in.

According to this theory, every action causes the creation of a new universe, and that there are an infinite number of universes that exist. When you killed your ancestor, you created a new universe, a universe that was identical to your own up until the time you changed the original succession of events. So if you go back in time and make people stop WWI or WWII or pearl harbour attack or ...... then it will create a new universe but the universe you came from will have to bear those wars. The point is that you cannot change the past of a universe but can create a new universe similar to it.

[martimus]

a bit like what doc brown said in back to the future 2

[Corky13]

Yeah...and id has something from the "butterfly-effect"
Well i think paralell universes are very possible...

[Chokin Hazard™]

There could be a parallel universe.

Theres this threory that states that whenever an atom(?) has choice it splits into two thus creating another universe, I think..... I could be wrong

[ross_coe]

there was an episode of Futurama where Fry and the crew travelled back in time to 40's or 50's america....to the exact place where Fry grandfather met his grandmother. One thing led to another and Fry ended up in bed with his young grandmother. Thus he was actually his own grandfather,
There was a similar episode of Red Dwarf in which it was revealed that Lister and Kachanski where Listers parents.

Does this create a paradox??? Kinda like the chicken/egg question??? If Fry hadnt gone back in time, he would never have been born. What would happen to his future self?

[Phynius Gauge]

I won't argue about the feasability of time travel, because I don't know enough about it, but I think that a mature civilization advanced enough to be able to create a time machine would make the decision not use it. There would be too many uncertainties and dangers involved.

An idealist would think that if he went back in time and prevented WW2 by murdering Hitler that he would make the world a better place, but he would most likely in effect either prevent or alter the existence of himself and millions of other people, perhaps even you and me. WW2 was an unspeakably horrible thing, but it caused many people to migrate and many events that if didn't happen, nothing would be the same. From an individual perspective, a soldier who died in WW2 might instead have wound up marrying your grandma instead of your grandpa marrying her, thus throwing two generations of your family into obliteration. Now imagine that on the scale of the millions of soldiers who died in WW2 and you start to see what a profound effect time travel can have in a very small portion of time (relative to the universe). And I'm not saying they deserved to die by any means, but preventing WW2 would alter history so much that so many more people would not exist than the amount of people who ceased to be during the war.

And the effects of time travel grow exponentially as time continues. For instance, imagine that you travel back in time a hundred thousand years and all you do is step on a single blade of grass and then return to your original point in history. Superficially, this example seems very trivial in that you assume one blade of grass is so insignificant to the universe that it could virtually do no harm to your timeline. But imagine a fly was to land on that blade of grass in your original timeline, and in this altered timeline the fly instead gets in the way of a wandering drunk, who would have been robbed had he continued on his way, but instead stops to swat at the fly, and the theif who would have robbed him in the original timeline instead robs and murders a kings messenger in this altered timeline, and prevents the king from obtaining a vital treaty that would have prevented the deaths of millions and did in the original timeline, but in the altered timeline, the king goes to war with a neighboring tribe and you can only imagine what happens from there :eek:. Looking at it from this perspective, you can imagine that even if you didn't step on that blade of grass, all you would have to do is exhale a breath of air, a single seemingly insignificant breath of oxygen, and it could slightly alter the air currents nearby, blowing that fly onto a different course and causing a whole different sequence of events to take place that would dramtically change the world more and more the farther they spread out over the timeline. These examples may be highly exaggrated and unlikely, but they illustrate my point that time travel presents way to many dangers to ever be put into use, even if the technology becomes feasible.

The human race at its current stage of immaturity and ignorance might attempt to use time travel if it had the technology, but when (and if) the technology does become feasible, I would assume that the human race would be at a level of unfathomable intelligence, and would wisely choose not to f*ck with such a dangerous concept.

And then there's all the paradoxes that can occur like Ross_coe mentioned.

And the above is assuming that there is only one timeline, but when you add parallel universes into the mix, then the level of uncertainty, complexity, and danger increases to such levels that I don't need to think about for my brain would likely explode.

Oh, and BTW, I think someone queried that if future humans are using time travel, why can't we see them? My opinion is that if a future humanity did use time travel, they would only let us see them if they wanted to be seen, for they would probably only use it to observe, and they would be extra careful that none of the above took place.

Simply put, time travel is ridiculous :).

[PhantomOokami]

"Oh, and BTW, I think someone queried that if future humans are using time travel, why can't we see them? My opinion is that if a future humanity did use time travel, they would only let us see them if they wanted to be seen, for they would probably only use it to observe, and they would be extra careful that none of the above took place." Maybe they altered our exsistance? lol. Highly doubt it...

but seriously dude, you are 100% right.. well to me you are. I think you just ended this discussion.

[Dr.N]

wow this thread is really popular in here lol

http://img17.exs.cx/img17/4319/lol39.jpg

[Chokin Hazard™]

True that Dr.N LMAO. I didnt even notice hahahaha ahahahah

But anyways

Time travel cannot be possible if it is then someone from the future could have appeared in our current time and told us about the future..............

[Corky13]

Yeah this Thread ownz :D

Well maybe there are time-travellers..and they did something very human-> Mistakes. What if Rosswell was a incident with a time machine. What if Area51 contains a demontaged time-machine. Ok the examples are all very stupid but its just interesting to think of it. I think humanity is truly stupid enough to use a time-machine if they could there fingers on one

[Chokin Hazard™]

Yeah you could be right.
Or maybe humans are stupid and teleported their "time machine" to a time that never existed and poooooF!

[Corky13]

Yeah and now the ultimative theory= live itself is made by humans= We traveled back to the point where the first water existed in live...the first lake etc. and some funny guy pi**ed into the water...a guy with some kind of bacterial sickness so the first lifeform are bacterions in pee. *lol* Nope ok that was stupid but i couldnt resist...sorry but it would be interesting to know if Life invents itself

[Dr.N]

lol corcky that was funny!~

[Chokin Hazard™]

Originally posted by Dr.N
lol corcky that was funny!~

[Jason-Lavoie]

yeah my name ius in that pic.. YEAHH

thats all i have to say... lol

[PhantomOokami]

Ah, this thread is really interesting though. It deserves those comments and views!

[Thapa_Laxman]

Apart from the Sun the nearest start to us is Alpha Proxima(if I am right). This faint star is approximately 4.25 light years away from us. In other words, light travelling at it's speed of 186,000 miles per second it would take 4.25 years to get here in Earth.
This means that we are actually seeing the past of our second nearest star. In fact light from our very own sun takes about 8 secs, that means ..... So, I doubt if anything such as present really does exists?

And I didnot forget to thank you all for your comments or did I :) .

[Corky13]

Well...if you think more subjektive than objetive you live in the present.....For you personal it is happening NOW...everything...
Well of course if you think more objektive you recognice you "maybe" live in a kind of past...and thats why "time" or the "counting of rehappening events such as a clockwork" was invente..some people had to thought objektivetly....

YAY ! 30500 Views...this thread ownz a lot of people it seems :D

[Thapa_Laxman]

I got this link and it says: -

Morlocks aside, how would YOU like to visit, even live hundreds of years in the future? There may be a way, and that is the purpose of The Time Travel Fund(tm). ........... The concept is that one day, it may be possible for people living far in the future to retrieve you from your current frame of reference (their past - your present) and bring you into the future (their present - your future

Life after Death - Time Travel (http://www.timetravelfund.com/)

I wonder how many people have joined them or became fool!!!

[Corky13]

pfff..the sent of stupid fools blow my Brain away...
How can somebody really pay for something like this ? -_-

[Phynius Gauge]

Sorry to revive a dying thread, but the idea of a timeline as a single fixed sequence of infinity rules out free will, without even considering time travel. The concept of an infinite timeline is like fate, in the sense that the universe has already ended at some distant point in time, and you're life is just a page in an book that we are reading through, with no control over the plot. Thus, everything that is, has, and will happen has already been "planned" by the entity that is time. Personally, I don't like this idea, but it may nevertheless be true. However, it may be possible that there is no existence beyond the present, and that time is a human invention, like somebody already stated, used to by humans to measure the interval between one event and another. Perhaps it is like math (well, we use math to express time, but regardless of this) in that it didn't exist until humans created it, and it is just another language to help us relate to reality. But then that voids the theories of all these brilliant scientists who actually know what they're talking about (the relationships of space, time, gravity, and all the jargon that comes along with said relationships that surpasses the level of the humble layman like myself :D). I'm just a wannabe philosopher :D.

[Thapa_Laxman]

No paradox in time travel
Professor Stephen Hawking puts forward the concept of a cosmic censor, an omnipotent entity that intervenes to prevent the occurrence of a paradox. It operates something like this. If a man goes back in time and tries to alter his past, for example by trying to kill one of his ancestor then the cosmic censor would have it that the killed man was not really his ancestor. If he attempts to suicide by killing his earlier self, the cosmic sensor would take a more active role, depending on the method employed. If, for example, the time traveler tries to shoot his earlier self, then the gun will misfire or bullet will simply miss. The cosmic censor, then, ensures that any and every attempt by the time traveler to change the history will be irritated.

Alternative Universe
Another theory regarding time travel brings up the concept of parallel universe, or alternative universe. According to it, when a man travels back in time, he enters a reverse time, mirror image, of our universe. When he starts moving forwards in time again, the same direction as us, he is in an alternative universe or parallel universe. For instance, if you were to travel back in time and kill one of your ancestor, you’ve only killed that person in one universe, which is no longer the universe that you exist in, i.e. you kill the alternative ancestor in that universe. There is then no paradox: his real ancestor, un-murdered, inhabits an entirely different universe, some distance in the fifth dimension from the one in which the murder is committed. Now, if you then try to travel back to your own time, you may end up in another universe and never be able to get back to the universe you started in.

The idea here is that every action causes the creation of a new universe, and that there area an infinite number of universe that exist. When you killed your ancestor, you created a new universe, a universe that was identical to your own up until the time you changed the original succession of events.

[Thapa_Laxman]

Time Travelers????
It is possible that they have been here, and is here right now, but has been discreet about their presence in order to ensure that they return to something closely approximating the future universe of their departure, remembered alternative universe .
For time travel we need to travel faster than light. But when we emerge from faster than light travel, we will be in another Universe. But this may present no problem. For if it is similar to our own, in that up to the point of departure we have common history, then neither we, nor the inhabitants of this new Universe, will ever detect the difference..

[A*HOSNY]

well its so long thread but here is my 2 cents
you can see the past only not the future
and you can not travel by your body to the past or the future
why ?
i think so:D

[Thapa_Laxman]

just to revive a dying thread......

[Thapa_Laxman]

I wonder if this is the longest Off-Topic Discussion thread !
80,000+ reads

[martimus]

it scares me when threads come back from the dead

[Phynius Gauge]

Well, it's a good thread. Someone needs to start another one as thought provoking :).